High Availability Hardware; Heartbeat Signals; Mirroring - Nortel CallPilot Install Manual

14 Chapter 2 Introduction
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High Availability hardware

High Availability is supported only on the 1005r platform. Two 1005r servers
are required for the High Availability configuration.
The 1005r server is equipped with two extra dual-Ethernet interface
cards that provide the following three connections between the two High
Availability servers:
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These three connections are critical to High Availability operation. Nortel
recommends that these three connections be made directly, using crossover
cables instead of a hub or switch. Failure of any device such as a hub or switch
in the signal path can create an unwanted results.

Heartbeat signals

The standby server needs a way to tell if the active server is running to know
when to take control if the active serves ceases to run. This is accomplished
through the use of a heartbeat signal that is communicated between the
active and standby server.
Due to the importance of the heartbeat signal, a pair of physical links
(Heartbeat 1 and Heartbeat 2) between the active and the standby servers
are used to transport the signal. This way, if either of the links fail, the
heartbeat signal still has a path between the two servers.

Mirroring

In order for the standby server to take over call processing, the server must
have the same configuration as the failed active server and have access to
all of the data (such as the users and the Application Builder applications)
on the failed server. This task is accomplished by mirroring data between
the two servers. This way, if an active server fails, the standby server of the
pair has an up-to-date copy of all of the data from the active server so it can
take over the role of the failed active server.
Copyright © 2007, Nortel Networks
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System control and monitoring and disk mirroring of the High Availability
system is provided by the EMC AutoStart software. For more
information, see "AutoStart software" (page
The Heartbeat signal (HB1) connection is used to monitor the state
of the active server.
The Heartbeat backup signal (HB2) connection is a backup of HB1 in
case the IP interface for HB1 fails.
The Mirroring connection is used for mirroring data between the two
servers.
Nortel CallPilot
High Availability: Installation and Configuration
NN44200-311 01.06 Standard
5.0 15 May 2007
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